Another type of defect is a localized stacking fault [1]}, [2]}, [3]} within a large RMG system, namely a Bernal fault or a twin boundary fault, Fig. REF . They are particularly interesting because they introduce additional flat bands into the energy spectrum. For a Bernal fault, we find that it introduces a weak connection between two sections of RMG and that the interacting ground state is a straightforward generalization of the AF state with odd parity. The twin boundary fault, however, creates a stronger connection between two RMG sections: the interacting ground state is also a AF state, but with even parity within each spin-valley flavor. For both of these types of ground state, the Chern number per spin-valley flavor has magnitude \(N/2\) , as is the case for pristine RMG [4]}, [5]}, [6]}.
